Which pins for AUX in ?

i was wanting to add a 3.5mm jack to my stereo for aux input and thought rather than buying a lead i will make one up myself or solder straight onto the pins for now

the back of my stereo is like the photo so if any one can tell me which pins are used for aux in and if its possible ? i realise the sticker indicates whats what but nothing obvious for aux in ,unless i cant do it ?

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